Buying tokens, which can be exchanged for a service at an unknown ratio (price), amounts to financing a new fast food chain by buying a million tokens for $1,000, where the tokens can be used to purchase hamburgers once the chain opens. The problem is that you have no idea if those million tokens — once the chain is up and running — will buy a thousand hamburgers or three.
So there’s a dichotomy here. Either your tokens remain low in value, and the end product of the business will be cheap (as it’s priced in these tokens) and you make no money as an investor, or the token price will increase and the end product will be expensive (but you’ll be able to sell your tokens for a profit).
In the end it’s a useless proposition: either token holders will be able to buy cheap hamburgers if the token price is low (thus causing a loss to the issuer/hamburger producer) or they will sell their expensive tokens for dollars and use dollars to buy their hamburgers elsewhere.